March 2003 - Boost-users - lists.preview.boost.org

[uBLAS] operations thoughts
by vladimir josef sykora 28 Mar '03

28 Mar '03

Hello, Had a quick look into uBLAS library, and noted the incompatibility between std::vector<> and ublas' binary operations. For example, I have an ublas::matrix<> and wanted to multiply it by a std::vector<>. Since _all_ of ublas data containers provide iterators, I'm wondering why the library doesn't provide algorithms that work on iterators? In this way data structures and operators will be decoupled. For example, to do the product between a matrix and a vector: ********* untested code ********* template <class MatrixRowIterator, class MatrixColIterator, class InputIterator, class OutputIterator> OutputIterator prod(MatrixRowIterator first_row, MatrixRowIterator last_row, MatrixColIterator, InputIterator first_vec, OutputIterator result) { InputIterator cp_first=first_vec; while(first_row!=last_row) { typename MatrixRowIterator::value_type val(0); MatrixColIterator first_col, last_col; first_col=first_row.begin(); last_col=first_row.end(); while(first_col!=last_col) val+= *first_col++ * *first_vec++; *result++ = val; ++first_row; first_vec=cp_first; } return result; } // user side : prod(umatrix.begin1(), umatrix.end1(), umatrix.begin2(), std_vector.begin(), std::back_inserter(std_vector_result)); This of course with the respective preconditions. Also, wouldn't be a good idea to provide copy c'tor and operators accepting std::vector<> for the ublas::vector<> ? Regards, -- vladimir josef sykora morphochem AG gmunder str. 37-37a 81379 muenchen tel. ++49-89-78005-0 fax ++49-89-78005-555 vladimir.sykora(a)morphochem.de http://www.morphochem.de

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BGL properties question
by Jeff Holle 28 Mar '03

28 Mar '03

I would like to write a "generic" routine that prints the named vertex and edges properties. I can see in this code sibit (from graphviz.cpp) that the info that I want is present: > vertex_label(const Vertex& u, const GraphvizDigraph& g) { > boost::property_map<GraphvizDigraph, > boost::vertex_attribute_t>::const_type > va = boost::get(boost::vertex_attribute, g); > return (*(va[u].find("label"))).second; > } It appears that va is a map<Vertex, map<string, "property value"> > How would I write code that prints the names of the properites of a given vertex? (It would involve iterating over the map whose find method is used in the above code segment).

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BGL 1.30.0 upgrade problem
by Jeff Holle 28 Mar '03

28 Mar '03

Having switched from boost_1_29_0 to boost_1_30_0, code that was compiling and running now produces this error message: I'm using Mandrake linux 9.0 with the gcc v3.22 compiler. /home/jholle/boost_1_30_0/boost/graph/connected_components.hpp: In function `boost::property_traits<IndexMap>::value_type boost::connected_components(const Graph&, ComponentMap) [with Graph = boost::subgraph<boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, boost::GraphvizVertexProperty, boost::GraphvizEdgeProperty, boost::GraphvizGraphProperty, boost::listS> >, ComponentMap = boost::iterator_property_map<__gnu_cxx::__normal_iterator<size_t*, std::vector<size_t, std::allocator<size_t> > >, boost::subgraph_property_map<boost::subgraph<boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, boost::GraphvizVertexProperty, boost::GraphvizEdgeProperty, boost::GraphvizGraphProperty, boost::listS> >*, boost::vec_adj_list_vertex_id_map<boost::GraphvizVertexProperty, size_t> >, unsigned int, unsigned int&>]': BGLLayout.cpp:49: instantiated from here /home/jholle/boost_1_30_0/boost/graph/connected_components.hpp:99: `sizeof' applied to incomplete type `boost::STATIC_ASSERTION_FAILURE<false>' The code that produced this error is: void BGLLayout::FindComponents(void) { typedef vector<unsigned int> Ints; Ints c(num_vertices(m_graph)); connected_components(m_graph, make_iterator_property_map(c.begin(), get(vertex_index, m_graph), c[0])); << -- line 49 (error source) m_componentStartVertex.clear(); unsigned int i=0; for (Ints::const_iterator iter=c.begin(); iter != c.end(); ++iter,++i) if (m_componentStartVertex.size() <= *iter) m_componentStartVertex.push_back(i); } Note this code is largely taken from connected_components.cpp. Can anybody tell me what is wrong here?

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'boost::detail' problem
by Alejandro Escalante Medina 27 Mar '03

27 Mar '03

I do also a problem with some code that used to work in 1.29. The following is the output of VC7: d:\development\boost\libs\test\src\unit_test_main.cpp(63) : error C2872: 'detail' : ambiguous symbol could be 'boost::unit_test_framework::detail' or 'boost::detail' I saw someone reported something similar, but I couln't figure out what's wrong... Any ideas? Alex _________________________________________________________ Do You Yahoo!? La mejor conexión a internet y 25MB extra a tu correo por $100 al mes. http://net.yahoo.com.mx

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Re: bjam issue related to boost::python
by Ben Hutchings 27 Mar '03

27 Mar '03

In article <23681.5566233874$1028263753(a)news.gmane.org>, Srivatsan Raghavan wrote: > hi all , > i created a c++ extension module using python which worked fine.. > > then i wanted to embed a call to PyRun_SimpleFile in another app, > and the script i was calling is attempting to use my extension module > > but i was getting telling me that the interpreter wasn't initialized > after much searching, research, and work with msvc's Dependency Walker > i narrowed it down to the fact that boost_python_debug.dll is trying to > link to the release version of python22.dll , whereas it should be > linking to python22_d.dll (which unfortunately does not come with the > python installer , that has to be compiled manually ) > > at any rate, how can the boost::python Jamfile be modified to try this > check when it comes boost::python ? This is correct. The 'debug' configuration is meant to work with a release version of Python, though I don't know why. However, there is no need to modify the Jamfile; just use the 'debug-python' configuration instead. Also, make sure you include <pyconfig.h> before any of the Boost.Python headers, because not all of them do that and you can end up with incorrect structure definitions in a debug build if you don't. (I should report this bug.)

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newbie build question (threads and win32)
by Dave Viner 27 Mar '03

27 Mar '03

Hi, I'm trying to use Boost's threads on WIN32 using VC++ and having some difficulty. I've built the source cd D:\boost\boost_1_30_0; bjam "-sTOOLS=msvc" and after the build is done, there are some errors, but they all appear related to the regression testing. Then I cd libs\thread\build; bjam "-sTOOLS=msvc" and everything appears to work fine. However, my simple program can't compile. I get this error: d:\boost\boost_1_30_0\boost\thread\thread.hpp(17) : fatal error C1189: #error : Thread support is unavailable! My test program simply is: #include <boost/thread/thread.hpp> int main(int argc, char* argv[]) { printf("Hello World!\n"); return 0; } I can't seem to figure out why threads aren't enabled. I realize this is a very simple question, but I'd love to hear what silly thing I've done wrong. Thanks in advance for your help. dave

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RE: [Boost-Users] Problem with 1.30.0 lexical_cast
by Tom Matelich 27 Mar '03

27 Mar '03

I agree :( I tried to use the debugger, but once it went into stlport_icl.dll I couldn't see which ostream function was being called. I'm currently trying to change the ostream signature to take a reference rather than a copy, in hopes that that will help. Unfortunately the amount of code to compile between these areas is quite large. > -----Original Message----- > From: Terje Slettebø [mailto:tslettebo@chello.no] > Sent: Wednesday, March 26, 2003 9:15 PM > To: Boost-Users(a)yahoogroups.com > Subject: Re: [Boost-Users] Problem with 1.30.0 lexical_cast > > > >From: "Tom Matelich" <tmatelich(a)zetec.com> > > > Compiler: gcc 3.2 and 3.2.2 > > > > I believe this is actually a bug in gcc, but I'm going to > post it hopes > that > > someone can help me. We have a handy little tool for > generating enums > with > > associated string conversion and stream > insertion/extraction functions. > > When we upgraded to boost 1.30.0, lexical_cast'ing one of > these enums to > > std::string started behaving incorrectly, rather than the > name, it is > giving > > me the integral value. It seems that the lexical_stream is > being used. > > Unfortunately, my test case is working fine. The complete test case > > (including definition of ZAcquisition::PPG) is appended at > the end. The > > code I am seeing failure with looks like: > > > > void foo(ZAcquisition::PPG::Type gt) > > { > > ... > > std::string str; > > str = boost::lexical_cast<std::string>(gt); > > std::cerr << "DEBUG, storing encode for PPG: " << str << > ", aka " << gt > > << std::endl; > > ... > > } > > > > This outputs (for example): > > DEBUG, storing encode for PPG: 0, aka ONE > > > > I tried boost::lexical_cast<std::string, > ZAcquisition::PPG::Type>(gt) as > > well. > > > > Anyone have any ideas? For now I'm going to back out to 1.29.0's > > lexical_cast. > > > It happens on my Windows/Intel 7.0 box as well. > > It's a little difficult when you don't have a failing test > case. If you had > that, I could have looked into it. The above code works > correctly on Intel > C++ 7.0 (Windows), here. > > > Regards, > > Terje > > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Get 128 Bit SSL Encryption! > http://us.click.yahoo.com/xaxhjB/hdqFAA/xGHJAA/EbFolB/TM > -------------------------------------------------------------- > -------~-> > > Info: <http://www.boost.org> > Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> > Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> > > > Your use of Yahoo! Groups is subject to > http://docs.yahoo.com/info/terms/ > > ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

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very basic questions
by jeremmim 27 Mar '03

27 Mar '03

hello, i have downloaded the boost_1_30_0.tar.gz package. and have unzipped it. it has worked succesfully. we don't know what to do next: we'd like to use this library to build a graph. jeremie

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test report_level in 1.30.0
by John Van Horne 27 Mar '03

27 Mar '03

We just upgraded from 1.29.0 to 1.30.0 and started having a problem running in the unit test framework. When we start the test with the command line parameter "--report_level=detailed" the tests crash. They work fine if we set the environment parameter BOOST_TEST_REPORT_LEVEL=detailed, or when we set other command line parameters, such as "--log_level=detailed". I looked at the code in libs/test/src/unit_test_main.cpp and saw that the command line parsing for report_level doesn't occur until after the unit test suite has been invoked. It appears that the unit test is then getting a command line that contains "--report_level=detailed". In our case, it doesn't know what to do with this. I hacked our copy of unit_test_main.cpp to parse the command line for --report_level before starting the unit test suite, storing the value locally. Has anyone else had this problem? Are we using the unit test framework the wrong way? Do you think I fixed it the right way, and will there be an official fix soon? Thanks, -John Van Horne

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Building Boost with MSVC 6
by Alex 27 Mar '03

27 Mar '03

I fail to build the Boost libraries with MSVC 6. Specifically, I need to build the BGL but is complains that GRAPHVIZ_GRAPH is not defined. I am running: bjam "-sTOOLS=msvc" Please help!

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